How to create a JAR file ?

Does anyone know how to create a JAR file using JCreator ? i have try to create it but it gives me this error " Failed to load Main-Class manifest attribuite from c:\hello\.jar" which i doesn't know how solve it.

I know JBuilder and ANT (and JBuilder uses ANT for it) can generate the manifest for you if you tell them the required information (like the main class...).
Comes in handy when you want an ANT script that does everything from compiling to testing to building your distribution archives.
RTFM to find out how.